fitting GT153 pump speed temperature sensor

Does any water need to be drained from the Pulsa-Coil or pipes to fit this part?

Are there isolation valves to assist in this matter? i.e. will an electrician rather than a plumber be able to do this? Thankyou, Bobjob

If it is the DHW sensor.
Which is before the mixer valve.
Then turn off water supply.
Run hot taps till they stop.
Undo sensor gently, have a towel handy, do not get any water where it should not go / be.
And that is it.
Mike
MGC/H2O
Norfolk

I would also recommend you shut the tap once the water stops running out and then remove the sensor (This should reduce the chances of water being push back due to air). Use some PTFE tape around the thread as well, just so it reduces the chance of leaking.

Make sure the sensors are original and not duplicates! Yes we have seen some of those around. You can buy the right sensors from this page - Gledhill Pulsacoil 3 Spares